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Police said they responded around 11:36 am to a constriction site on Boundary Road after receiving a 9-1-1 call that a worker had fallen through a roof and landed inside the building.
The 24-year old from North Plainfield was working on the roof when he suddenly fell about 20 feet and suffered injuries to his head, back, leg as well as some possible internal injuries, police said.
He was conscious when officers arrived on location and was then brought to Jersey Shore University Medical Center.
The worker is employed by Hageman Roofing Company located in Ridgefield Park.
Marlboro Police investigating construction site injury 943thepoint.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from 943thepoint.com Daily Mail and Mail on Sunday newspapers.